In windows PowerDVD can create multichannel surround sound (Dolby Pro Logic 2) from 2 channel sources like Audio CDs, MP3s, etc. Is there any player in linux which can do this? Please reply.
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Produce 5.1 surround from MP3s
In windows PowerDVD can create multichannel surround sound (Dolby Pro Logic 2) from 2 channel sources like Audio CDs, MP3s, etc. Is there any player in linux which can do this? Please reply.
Grande Half-n-Half Cinnamon Ubuntu
Re: Produce 5.1 surround from MP3s
Please Someone
Banned
Every player is technically capable under Linux. It depends on the sound service you are using being setup for it. Now PowerDVD actually more or less upmixes a signal. There is a big difference between this and ProLogic technologies. ProLogic and ProLogic II are not an upmix and the information for the tracks is encoded into the audio as digital information inside an analogue track. It is an analogue stereo track with digital info saying send this here, send that there, and so on. That is not what I think you are looking for.
PowerDVD can decode ProLogic, that is another story all together and also not what I think you are talking about. As I said I think you are wanting to upmix and there is a lot online for information on how to do this. It is accomplished on the Linux system, not by the player.
Now in order to enable it you need to know what sound service you are running, whether you have PulseAudio or not, it is almost a given Alsa will be on the system. You can set up what you are looking for either way.
Type either depending on which you are using into Google.
Alsa upmixing.
PulseAudio Upmixing and surround.
Both are accomplished in PulseAudio by uncommenting one line with it in a config file. It's upmixing can leave something to be desired in my opinion though. I prefer doing it though Alsa, but it is more entailed, with that you get a lot more control.
Like with my Alsa configuration I have not only setup a device to handle my upmixing, I can set the crossover points on high and low pass filters for the satellites and sub of my 5.1 system. That is something I have never found if it was possible with PulseAudio and can vastly improve the listening experience. Why have unwanted frequencies going to speakers muddying up the sound is my personal taste though. There are others who just want it to work and not caring to accurate reproduction.
Do you just want it to work? Then odds are PulseAudio will get you by. But if you want the best quality reproduction and are a bit of an audiophile I would suggest looking into setting it up right using Alsa.
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Thanks for your reply. I was talking about the rear channel delays which Power DVD creates when the dolby prologic 2 option is enabled. My freind was actually playing an mp3 file. The surround effect was superb. I don't want the rear channels to just replicate the front channels. Please reply.How do I know which conf. (alsa or pulse) is running?
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Re: Produce 5.1 surround from MP3s
I tried searching "alsa upmixing" in Google but couldn't solve my problem.Can I get the surround effect by installing a new package? Is there anything called "open source surround".I mean is there any free utility or audio/video player which can create surround from 2 channel sources?.Again, REAL SURROUND SOUND & not just replication of the front channels.Please reply even if its not possible in linux. Just tell me that.
Last edited by linuxyogi; January 29th, 2010 at 07:14 AM.
Banned
Power DVD is not actually creating Dolby ProLogic2 on a file!!!!!Originally Posted by linuxyogi
There is no point to it where all it store is channel data!
If you read my last post I explained how the two versions of ProLogic worked. All PowerDVD is doing, is taking the upmixing from Windows, which doesn't necessarily blend channels to get a true center and LFE, then applying a delay on the back channels, nothing more. It is the same exact thing and doing the delay to keep the sound representation in phase, as close to realistic it can, nothing more! The problem with how it does this is it is a set value and not adjustable. The channel mixing or delay are what you hear is what you get. I can assure you it is not re-encoding it to ProLogic!
It is not applying some special technology to get surround.
You can apply the same effect in Alsa. It is a matter of using LADSPA plugins appropriate to what you want to do. For example, my get me by asound.conf has an upmix for 2.0 to 5.1 with high and low pass filters on the channels to clean up any muddiness in my sub plus unwanted low frequencies in my satellites.
My speakers are slightly slightly out of phase depending on the audio being staged and getting the effect you are talking about that you don't want. I have not had a chance to look at the LADSPA plugins myself for controlling delay. If you looked more into it, instead of just at the simple setup, it would have lead you to what I am talking about.
Not only that the attitude I get for trying to help you!
PulseAudio does not have any way to control delay to adjust staging as far as I know, similarly to Windows.
On the note of an Open Source a surround, I gave you what you are looking for! You though, just want something that you go oh ok installed here we go. That is what PulseAudio does but not with the delay to the back channels you're looking for. If you want more then just works, then you need to put some effort in. The ability is there to have what you want, all you had to do was dig deeper.
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I was just getting frustrated thats all.I am sorry.I will keep trying and write back if can get the surround sound working. Sorry.
Banned
I understand frustration. It is all good.
Linux has come quite a ways since I started using it. I have been using it with at least one full time machine for well over, OMFG, well over 15 years now. Has it been that long? I am now feeling a bit old..lmao.
With what you are looking to try to do, one thing to also look at for a LADSPA plugin is echo effect. With delay from what I understand you can replicate different room depths.
LADSPA contains a lot and I did a little research for you on places to get you started. There are so many of these plugins to do things that I am shocked someone needs to manipulate audio in so many ways.
Here are a few links:
http://alsa.opensrc.org/index.php/Ladspa_%28plugin%29
http://www.ladspa.org/
This last one so you can get an idea of how DSP works. It is a bit technical looking at quick glance, but lays out how it works.
http://www.dspguru.com/
Sorry for getting a bit short myself. I hope this helps.
Grande Half-n-Half Cinnamon Ubuntu
Re: Produce 5.1 surround from MP3s
Thanks for all that searching you did for me. I will definitely start checking out those websites you have mentioned. In the meantime let me tell you about this feature I came to know about mplayer. I typed the following command ----
“mplayer -af surround=15 -channels 4 filename.mp3”
I found out this command by typing man mplayer |grep surround
I guess I'am getting surround sound !!!
What is your opinion about this?
Now don't misunderstand. I will surely read those web pages you have mentioned.
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My speaker setup is like this --- A Creative 2.1 outputs the FR & FL. The RR & RL channels are connected to my Sony audio system. So, technically I have created a quadraphonic speaker setup.
Please confirm
I guess using the “-channels 4” switch with mplayer will downmix the center & LFE channels in case I play a DVD with 6 channel (Dolby Digital) recording.
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